Stapling machine



April 12, 1955 s. SEGAL 2,705,796

STAPLING MACHINE Filed Feb. 23, 1951 3 Sheets-Sheet 1 FIG. 3.

INVENTOR SAM UEL SEGAL ATTORN EY April 12, 1955 s. SEGAL STAPLINGMACHINE 3 Sheets-Sheet 2 Filed Feb. 23, 1951 INVENTOR SAMU EL SEGAL-ATTO R N EY 4 1 k m lvlllllllf za rill/4P4 Pa -Ell lll'llllll) April 12,1955 s. SEGAL STAPLING MACHINE 3 Shets-Sheet- 3 Filed Feb. 23, 1951 L AG E S L E U v ATTORNEY United States Patent STAPLING MACHINE SamuelSegal, New York, N. Y., assiguor to Wilson Jones Company, New York, N.Y., a corporation of Massachusetts Application February 23, 1951, SerialNo. 212,229

10 Claims. (Cl. 1-3) 'This invention relates to stapling machines,particularly although not exclusively to the type used as ofiiceappliances.

It is within the contemplation of this invention to provide a staplingmachine having a staple-strip carriage adapted to be pulled outforwardly from the body of the operative retraction of the carriage,generally resulting Q in binding, clogging and inoperativeness.

In the accomplishment of the above-mentioned objective it is a furtherobject of this invention to employ a novel form of pull-out carriagemember connected to the head or driving portion of the machine, wherebyboth carriage and driving head are simultaneously movable forwardly, andthereby at all times maintained in a mutually fixed relation. In thisaspect of my invention it is a further object to provide novel means formaintaining a strip of staples in fixed relative position with respectto the staple-carrying member and the head for both projected andretracted positions of the carriage.

Another object of my invention is to provide a onepiece connectionbetween the said carriage and driving head, thereby facilitating theconstruction of the device and enhancing its rigidity. It is also animportant object, in connection with the carriage-head unit, to enablethe components thereof to be readily assembled and disassembled withoutthe use of special tools, and to provide the assembled components withmeans for maintaining them in spring-locked immovable relation, so thatthe said components will not be dislodged or jarred from their lockedpositions by impacts and vibrations of the device during its operativeuse.

It is also within my contemplation to provide a stapling machine havinga pull-out carriage and head of the type above-mentioned, and which willbe maintained positively locked both in projected and retractedpositions. In this aspect of my invention it is an object to provide theforward and rear locking portions with retaining means for maintainingthe internal components against displacement.

Still a further object of my invention is to provide a staple-stripcarriage with staple-supporting means which will operatively maintain astrip of staples in proper position for longitudinal movement, and atthe same time provide adequate finger clearance to enable the strip tobe readily placed within the machine, or removed therefrom.

Another object of my invention is to provide means for the automaticretraction of the pulled-out carriage and head member. In this aspect ofmy invention it is an important object to employ the staple-strip feedspring for the purpose of applying a yieldable pull on the pulled-outcarriage member, thereby facilitating its retraction.

Other objects, features and advantages will appear from the drawings andthe description hereinafter given.

Referring to the drawings,

Figure 1 is a perspective view of the stapling machine embodying myinvention, the pull-out carriage being 2,705,796 Patented Apr. 12, 1955shown in its extended staple-loading position, the knob and fragments ofthe device being removed for clarity, a fragment of a staple strip beingshown above the magazine prior to loading.

Figure 2 is a side elevation of Figure 1, the driver knob and base beingshown in section, the magazine and driver member being shown inpivotally raised position with the pull-out carriage extended.

Figure 3 is a section of Figure 2 taken along line 3-3.

Figure 4 is a bottom view of the base of Figure 2.

Figure 5 is a perspective view of the carriage locking mechanism, aportion of the casing therefor being broken away for clarity.

Figure 6 is a longitudinal section, of the device of Figure l, with thecarriage member in its fully retracted and operative position, partsbeing shown in elevation for clarity.

Figure 7 is a section of Figure 6 taken along line 7-7.

Figure 8 is a section of Figure 6 taken along line 88.

Figure 9 is a section of Figure 6 taken along line 99.

Figure 10 is a fragmentary vertical section, partly in elevation, of thedevice of Figure 1.

Figure 11 is a somewhat enlarged fragmentary side elevation of the rearportion of the device of Figure 1. 12Figltre 12 is a section of Figure11 taken along line Figure 13 is a disassembled perspective view of thecomponents constituting the sub-assembly of the pull-out staple carriageand driver unit.

Figure 14 is a fragmentary longitudinal sectional view of the forwardportion of the sub-assembly of Figure 13.

Figure 15 is a vertical section of Figure 14 taken along line 1515.

figure 16 is a fragmentary bottom view of Figure 14, an

Figure 17 is a perspective view of the tubular housing for the staplemagazine portion of Figure 13, a fragment being broken away for clarity.

In the preferred form of my invention as illustrated, the combinationmagazine and driver unit 20 is pivotally mounted at 21 on the uprightwalls 22, the latter being part of the U-shaped strap 23 the bottomconnecting piece 24 underlying the base member 25 and being securedthereto by the fasteners 26. In underlying engagement with saidconnecting piece 24 and attached thereto by said fasteners 26 is theflat spring 27 carrying at the forward portion thereof the stop member28 extending vertically through the aperture 29 of base 25. The upperterminal of said stop member 28 is adapted for engagement with thebottom wall 30 of pivotal unit 20 when it is in its lowermost position(see Figure 6), said wall constituting the base of the magazine housing31, as will more clearly hereinafter appear. The arrangement is hencesuch that the yieldably supported member 28 serves as a shock-absorberin receiving the impact of pivotal member 20 during a downward movementthereof, the spring action of member 28 yieldably urging the entire unit20 into a position where the forward portion 32 of bottom wall 30 isspaced above the staple-receiving anvil 33 of base 25. Said member 20 isfurther held against upward movement and in its horizontal operativeposition by the round-headed pin 34 extending through aperture 35 in thelateral wall 36 of the main body housing 37, said pin partiallyunderlying the lip 38 of said wall 22 when the pin is in the projectedposition shown in Figures 11 and 12. The said pin 34 is mounted on theflat spring 39 anchored at 40 to the said wall 36, said pin acting as ayieldable detent when member 20 is pivotally raised, the spring 33retracting to the dot-dash positions shown in Figure 12.

Disposed between the bottom portions 41 of the said lateral walls 36 ofmain body housing 37, and extending longitudinally therealong, is thesaid tubular magazine housing 31, whose lateral walls 42, base 30 andintermediate horizontal walls 43 form a lower compartment 44communicating with the upper narrower compartment 45 formed by the upperlateral walls 46 and the top wall 47. The said base 30 contains thelongitudinally apertured portion 48 the forward and rear terminals 49and 50 thereof serving as limiting stops for the operative movement ofthe pull-out staple magazine and driver unit, as will more clearlyhereinafter appear. Attached to upper wall 47 of magazine housing 31, atanchorage 51 thereof, is the flat spring member 52 the forward portionof which carries the downwardly extending rear pusher stop 53 (seeFigures and 17), said stop extending through aperture 54 in wall 47. Theforward portion of stop 53 has a sloping cam surface 55 adapted to beengaged by the rear upstanding wall 56 when the pusher 57 is beingassembled in place, as will more clearly hereinafter appear, to give thestop 53 upwardly against the action of spring 52, whereby said wall 56will be permitted to move rearwardly beyond the stop 53 to the positionshown in Figure 10. The walls 42 and 43 of the tubular housing 31 alsocontain the forwardly disposed apertured portions 58, to receivetherethrough certain carriage locking elements to be hereinafterdescribed.

Slidably disposed within tubular housing 31 is the carriage member 59comprising the horizontal staple magazine portion 60 and the verticaldriver head portion 61. The magazine portion 60 comprises two parallelspaced staple rails 62 extending longitudinally along member 60 betweenforward and rear blocks 63 and 64, said rails being connected at theirlower edges by the transverse wall 65 (Figures 7 to 9 and 13), thestaple rail member being disposed within the channel 66 comprising thevertical walls 67 and the bottom connecting wall 68, the forward portionof bottom wall 68 contain ing the lateral slits 69 (Figure 16).

Extending between blocks 63 and 64 (Figure 6) and between the rails 62is the guide rod 70. Slidably mounted over said rod is the pusher member57 (Figure 16), comprising a substantially channel-shaped member withvertical walls 71 slidably disposed between rails 62 and lateral walls67 of channel 66, the upper raised portion 72 of the pusher havingattached thereto the longitudinally disposed strip 73 the rear portionof which comprises the aforementioned upstanding wall 56 and the forwardportion of which consists of a downwardly extending wall 74 with anaperture 75 through which extends the rod 70. Also disposed over saidrod 70 is the pusher spring 76 in abutting engagement with rear block 64and the said wall 74 of the pusher member 57. The arrangement is hencesuch that the spring 76 would yieldably urge the pusher member 57forwardly. The walls 71 of the pusher member are proportioned forabutment with the rear of a staple strip of predetermined dimensions, inconventional manner, whereby the pusher will yieldably urge such astaple strip mounted over rails 62 forwardly towards the driving head ofthe machine, as will more clearly hereinafter appear. The lateral walls67 of channel 66 are recessed at 77, to expose the sides of a staplestrip mounted on the rails, whereby finger room is provided forconvenient handling of a strip of staples.

The forward portions of walls 67 of carriage member 59 contain thenotches 78, and the rear portion of said walls contain the notches 79,said notches being adapted to receiving carriage-locking elements, aswill more clearly hereinafter appear, for holding the pull-out carriageagainst movement from its forward and retracted positions.

The front of channel 66 (Figure 13) contains the two upright parallelwalls 80, these being preferably integral with the lateral walls 67 andextending at right angles thereto. Said walls 80, which flank the frontblock 63, constitute the structural support for the driver head of thedevice, the components of said head portion being operatively mounted inplace over said walls, in a manner to be hereinafter described.

The resilient retainer member 81 (Figure 13) is adapted for slidableassembly between walls 80, member 81 comprising two resilient walls 82with upper outwardly extending flanges 83, the lower portion of themember comprising a raised central portion 84 containing thereon anupwardly extending spring retaining post 85. Portion 84 is formed byupper horizontal wall 86 and the two side walls 87, the latter being inspaced relation to walls 82. Said last-mentioned walls contain oppositeapertures 88 which, when the member 81 is in assembled relation betweenwalls 80, are in registry with the holes 89 in walls 80, there beingcorrespondingly disposed holes 90 in walls 87. The pin 91 is insertedthrough said holes 88, 89 and 90, thereby maintaining member 81 fixedrelative to walls 80. The opposite terminals 92 of pin 91 are flush withthe outer surfaces of walls 80. The parts are so proportioned that whenmember 81 is operatively in place, the lowermost walls 93 are spacedabove the upper edges of rails 62, as clearly shown in Figure 15, toprovide a clearance for accommodating either the foremost positionedstaples 94, or the foremost portion of the staple-strip pusher 57.

Proportioned for slidable assembly over walls is the outer driver casing95, the said flanges 83 of retainer 81 overlapping the upper edges ofcasing 95 when in its assembled position (Figure 15). The resiliency ofwalls 82 enables such walls to flex inwardly during the downwardlysliding movement of casing 95, said walls snapping back into theirvertical retaining position when casing 95 is brought down to its finallowermost position. The rear wall 96 of casing 95 has the aperturedportion 97 at the bottom thereof shaped to conform to the outer contourof the pusher 57, to permit such pusher and the staples actuated therebyto enter the lower portion-of casing 95. The front wall 98 of the casingserves not only as one of the lateral enclosing walls of the driverhead, but also as a stop to receive thereagainst the foremost staple(Figure 14). The rear wall 96 (Figure 14) carries on the outside thereofa flat spring member v99, attached thereto at 100, said spring carryingthe plunger stop pin 101 extending inwardly into the casing through thehole 102 thereof.

Disposed within casing 95, and vertically movable therein, is theplunger 103 (Figures 13 and 14) to the top of which is attached the knobbase plate 104 from which downwardly extends the spring post 105. The.rear wall 106 of plunger 103 contains the vertically slotted portion 107through which extends the said stop pin 101. The front wall 108 of theplunger contains the hole 109 through which extends the plunger pin 110of the plunger blade 111. 1

When the parts are assembled, as clearly indicated in Figures 6, 14 and15, the said blade 111 is in slidable engagement with the front wall 98of casing 95, the rear wall 106 being slidably engageable with the rearwall .96 of said casing 95, the side walls 112 and 113 being slidablyengageable with the said walls 82 of retainer81. The spring 114, mountedover posts 85 and 105, is in engagement with the under-side of knobplate 104 and wall 86 of the retainer member 81.

The arrangement is hence such that the plunger 103 together with theplunger blade 111 are urged upwardly under the action of spring 114, andare movable downwardly into an operative driving position, against theaction of spring 114, when a downward pressure is applied to the knob115 superimposed over plate 104. The slotted portion 107 is proportionedto limit the stroke of the driving mechanism, the pin 101 beingengageable with 'slot terminals 116 and 117 to limit the movement of theplunger. The reciprocal actuation of the plunger 103 causes the plungerblade 111 to move therewith, the lower edge 118 of which is adapted toengage the crown of an underlying staple, to operatively eject itthrough the outlet space 119.

It should at this point be observed that the disassembly of the drivinghead can be as readily effected as the assembly of the components. Therearward retraction of spring 99 will disengage the pin 101 from theslotted portion 107 of plunger 103, whereby the plunger can readily bewithdrawn from casing 95, together with blade 111. Thereafter a slightinward retraction, by manual pressure, of the resilient walls 82 willfree the upper edges of casing 95 from the flanges 83, enabling saidcasing to be withdrawn. The pin 91 can be pushed out with any simpletool, whereupon member 81 is withdrawn.

The entire carriage member is slidably disposed within tubular casing31, as aforesaid, and is movable between a retracted operative ordriving position as shown in Figure 6, to a pulled-out loading positionas shown in Figures 1, 2 and 10. The device is provided with aretractable locking mechanism adapted to hold the car riage firmly ineither its retracted or loading positions, the said locking mechanism,generally identified by the reference numeral 120, being disposed at theforward portion of housing 37.

The said locking mechanism comprisesa bracket 121 of inverted U-shapedcross-section, the-lateral walls 122 and 123 thereof being secured bypins 124 to the lateral walls 36 of housing 37. Supported by andextendingdownwardly from connecting wall 125 of bracket 120 is the guiderod 126 over which is slidably mounted the cross-bar 127 of theretractable lock unit 128 the downwardly extending legs 129 of whichcontain locking terminals 130. Mounted over rod 126 and disposed betweenwalls 125 and 127 is the spring 131, yieldably urging member 128downwardly. The said legs 129 contain therein oppositely disposed holes132 through which extend the lock-actuating pin 133, said pin extendingdownwardly through the vertical slotted portions 134 of the lateralwalls 36 of housing 37 (Figures 2, 5, 6, 9 and Mounted upon pin 133 atopposite terminals thereof are the buttons 135 adapted to be actuatedmanually upwardly against the action of spring 131. It will be observedthat the said legs 129 of locking unit 128 are slidably disposed withinslotted portions 136 in the opposite walls 122 and 133 ,of bracket 120,thereby permitting a vertical reciprocating motion of said lockingmember 128.

The said spring 131 yieldably urges member 128, as aforesaid,downwardly, the lower terminals 130 thereof being urged intoengagementwith the upper edges of the walls 67 of channel 66, the saidterminals 130 extending through the apertured portions 58 of tubularcasing 31. However, when the carriage member 59 is pulled out to itsfullest extent, the rear recessed portions 79 of walls 67 will be inregistry with apertured portions 58, so that the said terminals 130 willyieldably enter the said recessed portions 79 to hold the pulledoutcarriage member locked in its loading position. To retract the carriagemember into its operative position, the two buttons 135 are againupwardly manipulated against the action of spring 131, therebyretracting the member 128 upwardly and removing the said terminals 130from their obstructing positions. The entire carriage member 59 is nowfree to be moved inwardly. It should be noted, however, that when thecarriage member was in its pulled-out position, the pusher spring 76 wasin its maximum extended and strained condition, so that it would beexerting an inward pull on the carriage member. Accordingly, when thelocking unit 128 is operatively raised, as aforesaid, the said pusherspring 76 will exert an inward retracting pull upon the carriage 59,thereby facilitating the return of the carriage into its operativeposition.

It will be observed that the rear portion of the carriage membercontains the setscrew 137 (Figures 2 and 10) which extends through theslot 48 in the base wall 30 of tubular casing 31. This setscrew isengageable with the front and rear extremities, 49 and 50, respectively,of slot 48, whereby it serves as a supplementary stop to limit theoperative movements of the carriage. In other words, when the buttons135 are operatively in raised position and the carriage member free formovement, the said screw stop 137 will prevent the carriage from beinginadvertently pulled out of the machine, and will also limit theinnermost movement thereof.

To load the device, the carriage 59 is pulled outwardly, as aforesaid,whereby the staple rail 62 will be exposed. The strip of staples 138(Figure l) is then positioned upon said rails, inside of walls 67. Sincethere are recessed portions 77 of walls 67, as aforesaid, access isreadily provided to the rails for proper positioning of the staples.Said recesses 77 also provide sufiicient finger room to enable thestaples to be operatively manipulated forwardly or rearwardly, or liftedout of the magazine. After the loading, the carriage is operativelyretracted, in the manner aforesaid, to its driving position. Thestapledriving portion is eifectuated as above indicated, merely bydepressing the knob 115.

It is of primary importance to observe that the pulling out andretraction of the carriage member 59 cannot, in my invention, affect orin any way alter the relationship between the plunger blade 111 and theforemost staple to be driven. This is due to the fact that the drivinghead and staple magazine portions are both contained in a singlesub-assembly unit, with the driving casing at all times maintained inimmovable relation with respect to the staple magazine. To assure suchan immovable relationship, it is preferred that the up right walls 80 bemade, as shown in the drawings, integral with the walls 67 of channelmember 66. In the arrangement shown, the walls 67 and are both formedfrom a single fiat sheet of material, thereby not only providing therigid structure desired, but also facilitating the fabrication of thisdevice. Since the walls 80 are the structural members upon which theentire driving head is supported, the fixed relation of walls 80 withrespect to walls 67 will provide for the entire drivinghead portion acorresponding fixed relation to the entire staple magazine. This appliesregardless of the position in which the carriage member may be disposed.The arrangement completely eliminates the disadvantage inherent in otherpull-out structures in which, upon a return of the pulled-out carriage,the former registry of the driver with the foremost staple is disturbedor altered. Because of this feature in my invention, there is alwaysease of action of the plunger without binding, and without the danger ofthe clogging of staples.

It will also be noted that all the assembled components in the drivingportion of the machine are springlocked, and that the slidable carriagemember is similarly spring-locked in both its loading and drivingpositions.

The arrangement is hence such that the assembled parts of the unit arefirmly maintained against displacement during the operative use of themachine.

In the above description, the invention has been disclosed merely by wayof example and in preferred manner; but obviously many variations andmodifications may be made therein. It is to be understood, therefore,that the invention is not limited to any specific form or manner ofpracticing same, except insofar as such limitations are specified in theappended claims.

I claim:

1. In a stapling machine, a main body member, a tubular casing rigidlymounted in said main body member, a pull-out carriage member slidablydisposed within the tubular casing and movable between a retractedoperative position and an extended loading position, said tubular casingsupporting said carriage member in each of said positions, the carriagemember comprising a staple magazine and a driver head portion at thefront of the magazine and communicating therewith, plunger means in thesaid head portion operatively movable along a path extendingperpendicularly to the plane of the staple magazine, a driver casing forsaid plunger means, and a driver-head support extending upwardly fromand being in fixed relation to the front of said magazine.

2. In a stapling machine, the combination accord ing to claim 1, saiddriver-head support comprising two parallel upright walls; said drivercasing being mounted over the outer surfaces of said walls, said plungermeans being slidably disposed within said driver casing.

3. In a stapling machine, the combination according to claim 1, saiddriver-head support comprising two parallel upright walls; said drivercasing being mounted over the outer surfaces of said walls, said plungermeans being slidably disposed within said driver casing, and a retainermember having two resilient walls in engagement with the inner surfacesof said upright Walls, the upper portions of said resilient walls havingoutwardly extending flanges in overlying retractable engagement with theupper edges of said driver casing, whereby the driver casing ismaintained against displacement.

4. In a stapling machine, the combination according to claim 1, saiddriver-head support comprising two parallel upright walls; said drivercasing being mounted over the outer surfaces of said walls, said plungermeans being slidably disposed within said driver casing, a retainermember having two resilient walls in engagement with the inner surfacesof said upright Walls, the upper portions of said resilient walls havingoutwardly extending flanges in overlying retractable engagement with theupper edges of said driver casing, whereby the driver casing ismaintained against displacement, the lower portion of said retainermember having a transverse wall, and a spring in engagement with saidtransverse wall and the said plunger means, said spring urging saidplunger means upwardly into its inoperative position.

5. In a stapling machine, the combination according to claim 1, saiddriver-head support comprising two parallel upright walls; said drivercasing being mounted over the outer surfaces of said walls, said plungermeans being slidably disposed within said driver casing, a retainermember having two resilient walls in engagement with the inner surfacesof said upright walls, the upper portions of said resilient walls havingoutwardly extending flanges in overlying retractable engagement with theupper edges of said driver casing, whereby the driver casing ismaintained against displacement, the lower portion of said retainermember having a transverse wall, a spring post extending upwardly fromsaid transverse wall, said plunger means having a knob member with aspring post extending downwardly therefrom, and a spring mounted overboth of said posts and in engagement with said transverse Wall and saidknob member, for urging said plunger means upwardly into its inoperativeposition.

6. In a stapling machine, a main body member, a tubular casing rigidlymounted in said main member, a pull-out carriage member slidablydisposed within the tubular casing and movable between a retractedoperative position and an extended loading position, said tubular casingsupporting said carriage member in each of said positions, the carriagemember comprising a staple magazine and a driver head portion at thefront of the magazine and communicating therewith, plunger means in thesaid head portion operatively movable along a path extendingperpendicularly to the plane of the staple magazine, a driver casing forsaid plunger means, a driver-head support extending upwardly from andbeing in fixed relation to the front of said magazine, said drivercasing being mounted upon said support, said driver casing having a rearwall and a retractable driver stop pin on said rear wall, said plungermeans having a vertically slotted wall through which said stop pinextends, for limiting the stroke of the plunger means.

7. In a stapling machine, a main body member, a tubular casing rigidlymounted in said main body member, a pull-out carriage member slidablydisposed within the tubular casing and movable between a retracted operative position and an extended loading position, said tubular casingsupporting said carriage member in each of said positions, the carriagemember comprising a staple magazine and a driver head portion at thefront of the magazine and communicating therewith, plunger means in thesaid head portion operatively movable along a path extendingperpendicularly to the plane of said staple magazine, a driver casingfor said plunger means, a driverhead support extending upwardly from andbeing in fixed relation to the front of said magazine, said drivercasing being mounted upon said support, said driver casing having afront wall, said plunger means having a front wall, a plunger blade, andinterengaging means on said front wall and said plunger blade forremovably holding said plunger blade in fixed relationship to said frontwall, said blade being in slidable engagement with said front wall ofthe driver casing.

8. In a stapling machine, a main body member, a tubular casing rigidlymounted in said main body member, a pull-out carriage member slidablydisposed within the tubular casing and movable between a retractedoperative position and an extended loading position, said tubular casingsupporting said carriage member in each of said positions, the carriagemember comprising a staple magazine and a driver head portion at thefront of the magazine and communicating therewith, plunger means in thesaid head portion operatively movable along a path intersecting that ofthe pusher means, a driver casing for said plunger means, a driver-headsupport extending upwardly from and being in fixed relation to the frontof said magazine, said driver casing being mounted upon said support,said driver-head support comprising two parallel upright walls, saiddriver casing being mounted over the outer surfaces of said walls, saidplunger means being slidably disposed within said driver casing, and aretainer member having two resilient walls in engagement with the innersurfaces of said upright walls, said plunger means having two side wallsin slidable engagement with the inner surfaces of said two resilientwalls.

9. In a stapling machine, a base member, a main body member pivoted tosaid base member, a tubular casing rigidly mounted in said main bodymember, a pull-out carriage member slidably supported within the tubularcasing and movable between a retracted operative position and anextended loading position, the carriage member comprising a staplemagazine and a driver head portion at the front of the magazine andcommunicating therewith, plunger means in the said head portionoperatively movable along a path extending perpendicularly to the planeof the staple magazine, spring means attached to said carriage memberand in strained condition when said member is in its said extendedloading position, whereby the carriage member is yieldably urgedinwardly from its loading position toward its said retracted position, alocking member in interlocking engagement with said carriage member whenin its said loading position, whereby the member is held in said loadingposition against the action of said spring means, and releasing meansfor said locking member.

10. In a stapling machine, a main body member, a tubular casing rigidlysecured in said main body member, a pull-out carriage slidably mountedin said tubular casing, cooperating means on said casing and saidcarriage to prevent complete separation thereof, said casing havingwalls fitting snugly against said carriage to support said carriage inany position to which it may be moved, said carriage being movablebetween a retracted operative position and an extended loading position,the carriage member comprising a staple magazine and a driver headportion secured to the front of the magazine in rigid relationshipthereto, the base of the tubular casing having a longitudinally slottedportion having a length equal to the distance the carriage moves betweenits retracted and extended positions, a stop pin secured to the rear ofthe carriage and extending into said slotted portion for engagement withthe opposite terminals'thereof to limit the longitudinal movement of thecarriage.

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